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A223380
Number of n X n 0..2 arrays with all horizontally or vertically connected equal values in a straight line, and new values 0..2 introduced in row major order.
0
1, 9, 777, 329840, 684434305, 6912575555900, 339059747829716414, 80685611230235666219160, 93110832687595932573861629271
OFFSET
1,2
EXAMPLE
Some solutions for n=3
..0..1..0....0..0..1....0..1..2....0..1..0....0..1..0....0..0..1....0..1..2
..1..2..0....2..2..0....2..0..1....2..0..2....1..0..1....1..2..2....0..2..1
..0..1..0....0..1..1....1..0..1....1..1..0....0..2..2....0..0..0....1..0..0
CROSSREFS
Diagonal of A223387.
Sequence in context: A159356 A246123 A246124 * A246125 A246126 A091057
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 19 2013
STATUS
approved